| 2523.21.00 | 00 | Portland cement: | | | | |
| 2524.90.00 | 45 | Milled fibers, group 4 and 5 grades | t | | | |
| 2525.10.00 | | Crude mica and mica rifted into sheets or splittings | | Free | | Free |
| 2526 | | Natural steatite, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rect- angular (including square) shape;talc: | | | | |
| 2528 | | Natural borates and concentrates thereof (calcined or not), but not including borates separated from natural brine; natural boric acid containing not more than 85 percent of H3BO3 calculated on the dry weight: | | | | |
| 2528.10.00 | 00 | Natural sodium borates and concentrates thereof (whether or not calcined) | kg | Free | | Free |
| 2529 | | Feldspar; leucite, nepheline and nepheline syenite; fluorspar: | | | | |
| 2529.22.00 | 00 | Containing by weight more than 97 percent of calcium fluoride | t | Free | | $5.51/t |
| 2529.30.00 | | Leucite; nepheline and nepheline syenite | | Free | | Free |
| 2530 | | Mineral substances not elsewhere specified or included: | | | | |
| 2530.10.00 | 00 | Vermiculite, perlite and chlorites, unexpanded | kg | Free | | Free |
| 2601 | | Iron ores and concentrates, including roasted iron pyrites: | | | | |
| 2601.11.00 | | Iron ores and concentrates, other than roasted iron pyrites: | | | | |
| 2602.00.00 | | Manganese ores and concentrates, including ferruginous manganese ores and concentrates with a manganese con- tent of 20 percent or more, calculated on the dry weight | | Free | | 2.2¢/kg on manganese content |
| 2602.00.00 | 40 | Containing less than 47 percent by weight of manganese | kg Mn kg | | | |
| 2602.00.00 | 60 | Containing 47 percent or more by weight of manganese | kg Mn kg | | | |
| 2603.00.00 | | Copper ores and concentrates | | 1.7¢/kg on lead content | Free (A,AU,BH, CA,CL,E,IL, J,JO, MA,MX, P,SG) | 8.8¢/kg on copper content + 3.3¢/kg on lead content + 3.7¢/kg on zinc content |
| 2604.00.00 | | Nickel ores and concentrates | | Free | | Free |
| 2605.00.00 | 00 | Cobalt ores and concentrates | kg Co kg | Free | | Free |
| 2606.00.00 | | Aluminum ores and concentrates | | Free | | $1/t |
| 2607.00.00 | | Lead ores and concentrates | | 1.1¢/kg on lead content | Free (A*,AU,BH, CA,CL,E,IL,J,JO, MA,MX, P,SG) | 8.8¢/kg on copper content + 3.3¢/kg on lead content + 3.7¢/kg on zinc content |
| 2608.00.00 | | Zinc ores and concentrates | | Free | | 8.8¢/kg on copper content + 3.3¢/kg on lead content + 3.7¢/kg on zinc content |
| 2609.00.00 | 00 | Tin ores and concentrates | t Sn t | Free | | Free |
| 2610.00.00 | | Chromium ores and concentrates | | Free | | Free |
| 2610.00.00 | 20 | Having a chromium content equivalent to not more than 40 percent chromic oxide (Cr2O3) | t Cr2O3 t | | | |
Harmonized Tariff Schedule of the United States inquiry: 3920590000
